Patent GB-832767-A (GB)
Title: Machine for locating metal straps around wooden articles, such as railway sleepers, for the binding thereof
IPC: B27M3/14
Filed: 1956-04-18
Abstract: 832,767. Bundling. DURRENBERGER, F. April 18, 1956 [April 22, 1955], No. 11744/56. Class 94(1). [Also in Group XXX] In a machine for binding wooden railway sleepers or ties by means of metal straps for the purpose of reducing or preventing splitting, a metal strap passed around three sides of the sleeper and with its ends overlapping above the fourth side is held in that position by a roller chain which passes over two guiding rollers carried respectively at the ends of two arms which rock about axes parallel with the longitudinal axis of the sleeper and are so arranged that when the roller chain is tensioned longitudinally they swing down to press the ends of the strap upon the upper or fourth side of the sleeper, in which position they can be welded together. A pair of uprights 3a at one end of a bed plate 1 and at opposite sides thereof provide end supports for a shaft 9 upon which is pivoted a pair of plates 8 supporting between their ends a shaft for a roller 10. The shaft 9 also carries a coaxial roller 21. Farther towards its longitudinal centre the base 1 carries a pair of upright supports 4 for the ends of a shaft 5 upon which is pivoted a pair of spaced parallel plates 6a and 6b supporting between them a shaft carrying a roller 7 disposed parallel with the roller 10. The shaft 5 also carries a coaxial roller 22. Below the parallel plates 6a, 6b a clamping-head 12 is pivoted at 13 to a crosshead 14a on the rod 14 of the piston of a pneumatic jack with its cylinder 15 mounted on the bed plate 1, and behind the cylinder 15 an oppositely directed cylinder 26 has a piston which supports a guide pulley 24 carried on a horizontal shaft with its opposite ends located in a pair of horizontal slideways. One end of the link chain 17 is secured to the rod 18 of the piston of a vertical jack which has its cylinder secured to the foot 3 of the machine frame, and the chain passes beneath roller 21 over roller 10 and over a stop or face 11 mounted on the uprights 3a, in which arrangement it is beneath or outside a metal strap positioned around the sleeper. Passing beneath the sleeper the chain is brought over the face of the clamping-head 12, over roller 7 and under roller 22 along a guide channel 23 and around the guide pulley 24 to a point 28 at which it is secured to the bed plate 1. The sleeper is first subjected to pressure between the stop 11 and the clamping head 12, through operation of the jack 15, after which the jack 26 is operated to tension the chain, whereupon the stress exerted by the chain shifts the arms 6 and 8 downwardly about their respective pivots and causes the ends of the strap to overlap over the surface of the sleeper. Clamping is completed by downward movement of the piston of the jack 19, when the chain and the hoop encompass the sleeper. Pressure is applied to the superposed ends of the hoop by a tool 33 carried by a piston operating in a vertical cylinder 31 which is carried by a lateral bracket 29 pivoted on an upright 30. In this position the ends of the hoop are welded together, preferably by arc welding. In the initial cutting of the metal strap to provide the necessary length plus overlap the cut is made at a transverse angle of 45 degrees. Reference has been directed by the Comptroller to Specification 695,056.